<title>「NOIP2009」Hankson 的趣味题</title><link href="http://hzoi.com/tomorrow.css" rel="stylesheet"><div class="ui existing segment"><pre><code><span class="pl-cp">#include</span> <span class="pl-cpf">&lt;cstdio&gt;</span><span class="pl-cp"></span>
<span class="pl-k">using</span> <span class="pl-k">namespace</span> <span class="pl-n">std</span><span class="pl-p">;</span>
<span class="pl-kt">int</span> <span class="pl-nf">gcd</span><span class="pl-p">(</span><span class="pl-kt">int</span> <span class="pl-n">a</span><span class="pl-p">,</span> <span class="pl-kt">int</span> <span class="pl-n">b</span><span class="pl-p">)</span> <span class="pl-p">{</span> <span class="pl-k">return</span> <span class="pl-n">b</span> <span class="pl-o">==</span> <span class="pl-mi">0</span> <span class="pl-o">?</span> <span class="pl-nl">a</span> <span class="pl-p">:</span> <span class="pl-n">gcd</span><span class="pl-p">(</span><span class="pl-n">b</span><span class="pl-p">,</span> <span class="pl-n">a</span> <span class="pl-o">%</span> <span class="pl-n">b</span><span class="pl-p">);</span> <span class="pl-p">}</span>
<span class="pl-kt">int</span> <span class="pl-nf">main</span><span class="pl-p">()</span> <span class="pl-p">{</span>
    <span class="pl-kt">int</span> <span class="pl-n">T</span><span class="pl-p">;</span>
    <span class="pl-n">scanf</span><span class="pl-p">(</span><span class="pl-s">&quot;%d&quot;</span><span class="pl-p">,</span> <span class="pl-o">&amp;</span><span class="pl-n">T</span><span class="pl-p">);</span>
    <span class="pl-k">while</span> <span class="pl-p">(</span><span class="pl-n">T</span><span class="pl-o">--</span><span class="pl-p">)</span> <span class="pl-p">{</span>
        <span class="pl-kt">int</span> <span class="pl-n">a0</span><span class="pl-p">,</span> <span class="pl-n">a1</span><span class="pl-p">,</span> <span class="pl-n">b0</span><span class="pl-p">,</span> <span class="pl-n">b1</span><span class="pl-p">;</span>
        <span class="pl-n">scanf</span><span class="pl-p">(</span><span class="pl-s">&quot;%d%d%d%d&quot;</span><span class="pl-p">,</span> <span class="pl-o">&amp;</span><span class="pl-n">a0</span><span class="pl-p">,</span> <span class="pl-o">&amp;</span><span class="pl-n">a1</span><span class="pl-p">,</span> <span class="pl-o">&amp;</span><span class="pl-n">b0</span><span class="pl-p">,</span> <span class="pl-o">&amp;</span><span class="pl-n">b1</span><span class="pl-p">);</span>
        <span class="pl-kt">int</span> <span class="pl-n">p</span> <span class="pl-o">=</span> <span class="pl-n">a0</span> <span class="pl-o">/</span> <span class="pl-n">a1</span><span class="pl-p">,</span> <span class="pl-n">q</span> <span class="pl-o">=</span> <span class="pl-n">b1</span> <span class="pl-o">/</span> <span class="pl-n">b0</span><span class="pl-p">,</span> <span class="pl-n">ans</span> <span class="pl-o">=</span> <span class="pl-mi">0</span><span class="pl-p">;</span>
        <span class="pl-k">for</span> <span class="pl-p">(</span><span class="pl-kt">int</span> <span class="pl-n">x</span> <span class="pl-o">=</span> <span class="pl-mi">1</span><span class="pl-p">;</span> <span class="pl-n">x</span> <span class="pl-o">*</span> <span class="pl-n">x</span> <span class="pl-o">&lt;=</span> <span class="pl-n">b1</span><span class="pl-p">;</span> <span class="pl-n">x</span><span class="pl-o">++</span><span class="pl-p">)</span>
            <span class="pl-k">if</span> <span class="pl-p">(</span><span class="pl-n">b1</span> <span class="pl-o">%</span> <span class="pl-n">x</span> <span class="pl-o">==</span> <span class="pl-mi">0</span><span class="pl-p">)</span> <span class="pl-p">{</span>
                <span class="pl-k">if</span> <span class="pl-p">(</span><span class="pl-n">x</span> <span class="pl-o">%</span> <span class="pl-n">a1</span> <span class="pl-o">==</span> <span class="pl-mi">0</span> <span class="pl-o">&amp;&amp;</span> <span class="pl-n">gcd</span><span class="pl-p">(</span><span class="pl-n">x</span> <span class="pl-o">/</span> <span class="pl-n">a1</span><span class="pl-p">,</span> <span class="pl-n">p</span><span class="pl-p">)</span> <span class="pl-o">==</span> <span class="pl-mi">1</span> <span class="pl-o">&amp;&amp;</span> <span class="pl-n">gcd</span><span class="pl-p">(</span><span class="pl-n">q</span><span class="pl-p">,</span> <span class="pl-n">b1</span> <span class="pl-o">/</span> <span class="pl-n">x</span><span class="pl-p">)</span> <span class="pl-o">==</span> <span class="pl-mi">1</span><span class="pl-p">)</span> <span class="pl-n">ans</span><span class="pl-o">++</span><span class="pl-p">;</span>
                <span class="pl-kt">int</span> <span class="pl-n">y</span> <span class="pl-o">=</span> <span class="pl-n">b1</span> <span class="pl-o">/</span> <span class="pl-n">x</span><span class="pl-p">;</span> 
                <span class="pl-k">if</span> <span class="pl-p">(</span><span class="pl-n">x</span> <span class="pl-o">!=</span> <span class="pl-n">y</span> <span class="pl-o">&amp;&amp;</span> <span class="pl-n">y</span> <span class="pl-o">%</span> <span class="pl-n">a1</span> <span class="pl-o">==</span> <span class="pl-mi">0</span> <span class="pl-o">&amp;&amp;</span> <span class="pl-n">gcd</span><span class="pl-p">(</span><span class="pl-n">y</span> <span class="pl-o">/</span> <span class="pl-n">a1</span><span class="pl-p">,</span> <span class="pl-n">p</span><span class="pl-p">)</span> <span class="pl-o">==</span> <span class="pl-mi">1</span> <span class="pl-o">&amp;&amp;</span> <span class="pl-n">gcd</span><span class="pl-p">(</span><span class="pl-n">q</span><span class="pl-p">,</span> <span class="pl-n">b1</span> <span class="pl-o">/</span> <span class="pl-n">y</span><span class="pl-p">)</span> <span class="pl-o">==</span> <span class="pl-mi">1</span><span class="pl-p">)</span> <span class="pl-n">ans</span><span class="pl-o">++</span><span class="pl-p">;</span>
            <span class="pl-p">}</span>
        <span class="pl-n">printf</span><span class="pl-p">(</span><span class="pl-s">&quot;%d</span><span class="pl-se">\n</span><span class="pl-s">&quot;</span><span class="pl-p">,</span> <span class="pl-n">ans</span><span class="pl-p">);</span>
    <span class="pl-p">}</span>
    <span class="pl-k">return</span> <span class="pl-mi">0</span><span class="pl-p">;</span>
<span class="pl-p">}</span>
</cpde></pre></div>